Enviroprobe utilizes the highest quality in EM equipment. The EM conductivity instrument operates by creating an alternating primary magnetic field in the transmitting coil at an audio-frequency. An electromotive force is produced in buried objects by the primary field. Due to the high conductivity of these objects, secondary loops of electrical current are created in the subsurface. This process is known as electromagnetic induction.

The receiving coil responds to an electromotive force generated by the resultant of the primary and secondary fields. The buried objects (e.g. drums, pipelines, etc.) produce characteristic anomalies in the recorded data. This is due to the addition of the secondary field to the primary. Electromagnetic methods can map subsurface objects rapidly and accurately.